21204341009 has 8 divisors (see below), whose sum is σ = 22999257288. Its totient is φ = 19470269440.

The previous prime is 21204341003. The next prime is 21204341021. The reversal of 21204341009 is 90014340212.

It can be written as a sum of positive squares in 4 ways, for example, as 2743140625 + 18461200384 = 52375^2 + 135872^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21204341009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204341003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15210452 + ... + 15211845.

It is an arithmetic number, because the mean of its divisors is an integer number (2874907161).

Almost surely, 2^21204341009 is an apocalyptic number.

It is an amenable number.

21204341009 is a deficient number, since it is larger than the sum of its proper divisors (1794916279).

21204341009 is a wasteful number, since it uses less digits than its factorization.

21204341009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30422355.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21204341009 in words is "twenty-one billion, two hundred four million, three hundred forty-one thousand, nine".